Hasmonean Judea, also known in part of its history as the Hasmonean kingdom, was an independent Jewish state in Judea and its surrounding regions, during the Hellenistic era of the Second Temple period. The Hasmonean state emerged from the Maccabean revolt against Seleucid rule. It was ruled by the Hasmonean dynasty, who descended from the Maccabees, and combined the offices of high priest and ethnarch, later assuming the title of kings. Initially, Judea remained semi-autonomous under the Seleucid Empire, but as Seleucid authority declined, the Hasmoneans gained full independence and expanded their territory into neighboring regions, including Perea, Samaria, Idumea, Galilee, and Iturea.
The Maccabees launched their revolt against the Seleucids in the 160s BCE, with Judas Maccabeus's victories and the rededication of the Jerusalem Temple following its desecration by the Seleucids. After Judas's death in battle, his brother Jonathan revived the movement, secured Seleucid recognition, and was appointed High Priest. Following Jonathan's execution, their brother Simon took command, expelled the Seleucid garrison from Jerusalem, and achieved independence, marking the foundation of the Hasmonean state. Simon was later assassinated by his son-in-law.